I've followed cricket for decades in the UK, and I can now watch it on ESPN here in the US. The sound technology and microphones pick up everything on the pitch.
I am puzzled by a shout heard after the ball is bowled. Someone shouts "play on!" but I can't figure out who.
I'm guessing it's an umpire letting the players know it's a valid ball. But who of the two umpires is calling and why doesn't it seem to be called for every ball?